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Quick Answer. It takes 9 to 10 hours to cook a 3-pound beef top round roast in a Crock-Pot at the low setting. The roast only requires about 5 hours of cooking time at the high setting, but this tough cut of meat isn't recommended for cooking on the high setting. The faster cook time and higher temperature doesn't break down the tough meat fibers and leaves the roast tough.
In the Oven. The simplest way to cook a whole top round roast is in the oven. Set the oven to 300 degrees Fahrenheit and place the top round in a roasting pan. Roast the meat until a meat thermometer inserted in the center registers 125 F -- one to two hours, depending on the size of the roast.